You've seen earbud zombies before -- they're the people who are walking or riding around with noise-isolating earphones plugged into their ears, totally oblivious to traffic noise, people talking or yelling at them, or the sound of screeching tires just before they get hit by a car. A few weeks ago, I wrote about AIRBudz, a Kickstarter project that is the one-woman campaign of Tammy Erdel to
